Siemens SIMATIC S7-300 Manual page 97

Example call An example call is shown below for FC RD_COM
STL
...
O DB_FM.JOB_RD.BUSY;
O DB_FM.JOB_RD.IMPOSS;
SPB DARD;
L B#16#66;
T DB_FM.JOB_RD.NO;
DARD: CALL RD_COM(
DB_NO := W#16#1,
RET_VAL := FEHLERCODE_LESEN)
UN BIE;
S FEHLER_LESEFKT;
...
6.4 Reading diagnostic information
Overview
FC DIAG_RD (FC 4) and FC DIAG_INF (FC 6) are used to read the diag-
nostic interrupt information in the user DB.
FC 4 and FC 6 are intended as alternatives which you can use according to
your needs.
6.4.1 FC DIAG RD (FC 4) – Read diagnostic interrupt data in OB 82
_
Task You are only allowed to call FC DIAG_RD in interrupt OB 82.
Can only be used with appropriate S7-300 CPU versions; see compatibility
list in Table 1-1.
FM 354 Servo Drive Positioning Module
Programming the FM 354
.
Explanation
// Read job busy
// Read job processing impossible
// Jump to call
// Read job 102 for basic operating data
// Store in job box
// Call read data FC
// DB number
// Return value
// Binary result
// Error on initialization
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